Consulta: subjectFacets:"Palynology"
Registros recuperados: 61
Data/hora: 12/06/2024 14:41:32

Climatic characteristics of the late Pleistocene and Holocene continental deposits from southwestern Syria based on palynological data
Provedor de dados: 66
Autores: Hussein,Kamal M.
The goal of this research was to reconstruct the vegetational and climatic changes that took place during the late Pleisocene and Holocene in southwestern Syria. This reconstruction was based on palynological data obtained from the analysis of 27 sediments and surface samples (with a total thickness of 4.55 m) collected from Al-Hijaneh Lake basin (late Pleistocene) and from Al-Aouaj River valley (Holocene). Three pollen zones were established. The oldest one (zone A) corresponds to the late Pleistocene lacustrine deposits of Lake Al-Hijaneh. Zones B and C were defined in the Holocene fluvial- lacustrine deposits of the Al-Aouaj River valley. These three pollen assemblage zones are correlated to synchronic and similar C14 dated pollen zones from Syria,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flora; Holocene; Late Pleistocene; Paleoclimates; Palynology; Syria.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932006000200003

First record of resting cysts of the benthic dinoflagellate     Prorocentrum leve     in a natural reservoir in Gujan-Mestras, Gironde, France
Provedor de dados: 5
Autores: Mertens, Kenneth; Gu, Haifeng; Pospelova, Vera; Chomerat, Nicolas; Nezan, Elisabeth; Gurdebeke, Pieter; Bogus, Kara; Vrielinck, Henk; Rumebe, Myriam; Meteigner, Claire.
The resting cysts of the benthic dinoflagellate Prorocentrum leve from a natural reservoir in Gujan-Mestras (Gironde, France) were described in this study. The incubated urn-shaped cysts gave rise to cells of Prorocentrum leve. Morphological observations through light microscopy and scanning electron microscopy, particularly of the periflagellar platelets, combined with large subunit ribosomal DNA sequences obtained through single-cell analysis confirm their affinity to the species Prorocentrum leve. The cysts are characterized by a specific shape and the presence of an anterior plug. This is the first conclusive evidence for fossilizable resting stages within the Prorocentrales, one of the major orders within the Dinophyceae. Palynological treatments show...
Tipo: Text
Palavras-chave: Cellulosic; Micro-FTIR; Palynology; Prorocentrales; Resting stage.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00398/50971/51728.pdf

Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae)
Provedor de dados: 16
Autores: Maas, P.J.M.; Westra, L.Y.T.; Guerrero, S. Arias; Lobão, A.Q.; Scharf, U.; Zamora, N.A.; Erkens, R.H.J.
A taxonomic revision of the genus Guatteria, including the former genera Guatteriella, Guatteriopsis and Heteropetalum is given. Within the genus Guatteria 177 species are recognized, 25 of which are new. Included are chapters on the history of the taxonomy of the genus, morphology, wood anatomy, karyology, palynology, chemistry, flower biology and pollination, dispersal, distribution and ecology, phylogeny and molecular studies, conservation, and uses. A synoptical key to all species is included, as well as two dichotomous keys, one for the species of Central America and Mexico, and one for the species of NE, E and SE Brazil. The species treatments include descriptions, full synonymy, geographical and ecological notes, vernacular names and taxonomic...
Tipo: Article / Letter to the editor
Palavras-chave: Annonaceae; Chemistry; Descriptions; Flower biology and pollination; Guatteria; Guatteriella; Guatteriopsis; Heteropetalum; History; Molecular studies; Morphology; Neotropics; Palynology; Phylogeny; Taxonomy; Vernacular names.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/588490

Palynological Characters and Their Phylogenetic Signal in Rubiaceae
Provedor de dados: 16
Autores: Dessein, S.; Ochoterena, H.; De Block, P.; Lens, F.; Robbrecht, E.; Schols, P.; Smets, E.; Vinckier, S.; Huysmans, S.
In the 1990s Rubiaceae became a hot spot for systematists, mainly due to the comprehensive treatment of the family by Robbrecht in 1988. Next to the exploration of macromolecular characters to infer the phylogeny, the palynology of Rubiaceae finally received the attention it deserves. This article aims to present a state-of-the-art analysis of the systematic palynology of the family. The range of variation in pollen morphology is wide, and some of the pollen features are not known from other angiosperm taxa; e.g., a looplike or spiral pattern for the position of apertures in pantoaperturate grains. We compiled an online database at the generic level for the major pollen characters and orbicule presence in Rubiaceae. An overview of the variation is...
Tipo: Article / Letter to the editor
Palavras-chave: Rubiaceae; Pollen morphology; Palynology; Phylogeny.
Ano: 2005
URL: http://www.repository.naturalis.nl/record/407298

Pollen of the Spermacoce (Rubiaceae) species from the Northern Territory of Australia: morphology and taxonomic significance
Provedor de dados: 16
Autores: Dessein, S.; Harwood, R.; Smets, E.; Robbrecht, E.
Complementary to the revision of the genus Spermacoce in the Northern Territory of Australia, pollen morphology of 48 of the 53 native Spermacoce species from the Northern Territory has been investigated by scanning electron and light microscopy. There is considerable variation for most diagnostic pollen characters. The average equatorial diameter (E) ranges from 10.5 to 41.7 Î¼m. Grains are invariably colporate with apertures situated at the equator (being zonocolporate). The number of apertures varies from 3 to 17. The endoaperture is generally an endocingulum, often with a secondary thinning at the ectocolpus; one species has endocolpi. The sexine is usually perforate, but psilate, foveolate, and (micro)reticulate patterns were also found. Supratectal...
Tipo: Article / Letter to the editor
Palavras-chave: Spermacoce; Rubiaceae; Pollen morphology; Palynology; Australia; Northern Territory.
Ano: 2005
URL: http://www.repository.naturalis.nl/record/407293

Hymenodictyeae (Rubiaceae – Cinchonoideae) and its phylogenetic significance
Provedor de dados: 16
Autores: Verellen, J.; Dessein, S.; Razafimandimbison, S.G.; Smets, E.; Huysmans, S.
The tribe Naucleeae has recently been recircumscribed on the basis of both morphological and molecular [rbcL, trnT-F, internal transcribed spacer (ITS)] evidence, and has been found to be the sister group of the tribe Hymenodictyeae Razafim. &amp; B. Bremer. In order to find pollen morphological support for this new classification, the pollen and orbicules of 65 species, representing 23 Naucleeae and the two Hymenodictyeae genera, were investigated by scanning electron and light microscopy. Naucleeae pollen is very small (&lt; 20 µm) to small (20–30 µm) and its shape in equatorial view is suboblate to spheroidal or, more rarely, subprolate. Three compound apertures are present, each comprising a long and narrow ectocolpus, a circular to slightly lolongate...
Tipo: Article / Letter to the editor
Palavras-chave: Compound apertures; Endoapertures; Orbicule morphology; Palynology; Sexine ornamentation; 42.48.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/422226

Palynological Variation in Balsaminoid Ericales. I. Marcgraviaceae
Provedor de dados: 16
Autores: Lens, F.; Dressler, S.; Vinckier, S.; Janssens, S.; Dessein, S.; Van Evelghem, L.; Smets, E.
Background and Aims Marcgraviaceae are a rather small family of seven genera and approx. 130 neotropical species. This study aims to present a detailed palynological survey of the family in order to comment on the intrafamily relationships and possible correlations with pollinators. Methods In total, 119 specimens representing 67 species and all genera are observed using light microscopy and scanning electron microscopy. Furthermore, eight species from five genera are studied with transmission electron microscopy.  Key Results Our results show that pollen grains of Marcgraviaceae are small (20–35 mm), have three equatorial apertures, granules on the colpus membrane, oblate spheroidal to prolate spheroidal shapes, mainly psilate to perforate ornamentations,...
Tipo: Article / Letter to the editor
Palavras-chave: Balsaminoids; Ericales; Marcgraviaceae; Neotropics; Orbicules; Palynology; SEM; TEM.
Ano: 2005
URL: http://www.repository.naturalis.nl/record/407283

Pollen Morphology of Some Turkish Salvia L. (Lamiaceae: Mentheae) Species
Provedor de dados: 87
Autores: AKTA,K.; ÖZDEMIR,C.; ÖZKAN,M.; BARAN,P.
ABSTRACT: In this presented work, the pollen morphologies of twenty-one taxa, nine of them endemic from Turkey, belonging to the genus Salvia (Lamiaceae: sub-family Nepetoideae: tribe Mentheae: sub-tribe Salviinae), S. aethiopis L., S. argentea L., S. aytachii Vural &amp; Adigüzel, S. blepharochlaena Hedge &amp; Hub.-Mor., S. cadmica Boiss., S. ceratophylla L., S. cryptantha Montbret &amp; Aucher, S. frigida Boiss., S. fructicosa Miller, S. halophile Hedge, S. napifolia Jacq., S. microstegia Boiss. &amp; Bal., S. recognita Fisch. &amp; Mey. S. sclarea L., S. smyrnaea Boiss. S. suffruticosa Montbret &amp; Aucher, S. tchihatcheffii (Fisch. &amp; Mey.) Boiss., S. tometosa Bertol, S. verbenaca L., S. viridis L., and S. wiedemanni Boiss. and collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exine ornamentation; Lamiaceae; Palynology; Salvia; Turkey.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100212

Estudo polínico em plantas de restinga do Estado do Rio de Janeiro: Clusiaceae Lindl.
Provedor de dados: 88
Autores: GONÇALVES-ESTEVES,VANIA; MENDONÇA,CLAUDIA BARBIERI FERREIRA.
Este trabalho trata da palinologia de oito espécies de Clusiaceae: Calophyllum brasiliense Cambess., Clusia criuva Cambess., C. hilariana Schltdl., C. lanceolata Cambess., C. parviflora (Sald.) Engl., Garcinia brasiliensis Mart., Kielmeyera membranacea Casar. e Symphonia globulifera L.f. Os grãos de pólen foram acetolisados, medidos, descritos e ilustrados sob microscopia de luz e microscopia eletrônica de varredura (MEV). Foram estudadas as principais características dos grãos de pólen como forma, tamanho, constituição da exina e aberturas. Constatou-se que os grãos de pólen foram pequenos, médios ou grandes, suboblatos, oblato-esferoidais, prolato-esferoidais ou subprolatos, isopolares, porados (3-6) ou 3-colporados, área polar muito pequena, pequena ou...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Clusiaceae; Restinga; Pollen.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000500007

Palinologia de espécies da tribo Eupatorieae (Compositae Giseke) ocorrentes na Restinga de Carapebus, Carapebus, Rio de Janeiro
Provedor de dados: 88
Autores: MENDONÇA,CLAUDIA BARBIERI FERREIRA; GONÇALVES-ESTEVES,VANIA.
Foram estudados os grãos de pólen de sete táxons pertencentes à tribo Eupatorieae, ocorrentes na Restinga de Carapebus, Carapebus, Estado do Rio de Janeiro. São eles: Barrosoa atlantica King &amp;amp; Robins., B. betonicaeformis (DC.) King &amp;amp; Robins., Mikania belemii King &amp;amp; Robins., M. cordifolia Willd., M. glomerata Spreng., M. micrantha H.B.K., M. trinervis Hook &amp;amp; Arn. e Trichogoniopsis podocarpa (DC.) King &amp;amp; Robins. A tribo apresentou em comum, grãos de pólen pequenos a médios, oblato-esferoidais a prolato-esferoidais, tricolporados, sexina espinhosa e cavada. Os táxons puderam ser separados quando foram consideradas a forma polínica, as dimensões do espinho e a distância entre eles. Assim, foi possível formar dois...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Compositae; Eupatorieae; Restinga.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000200009

Pollen morphology and availability of pollen and stigma in Syzygium (Myrtaceae)
Provedor de dados: 94
Autores: Nacata,Guilherme; Belonsi,Talita Kely; Gasparino,Eduardo Custódio; Andrade,Renata Aparecida de.
Abstract  The present study aimed to describe the pollen morphology in three species of Syzygium, to test pollen availability and stigma receptivity. The pollen was analyzed by light and scanning microscopy to show the detailed ornamentation of the pollen grains. Pollen availability was measured according to two protocols. Stigmatic receptivity was tested at different stages of flower development. There are differences among the pollen morphology for the species studied; when the polar and equatorial diameters are measured in the equatorial view of the pollen grains, it is observed that S. jambos is the largest species concerning the two values of the diameters, S. malaccense is the smallest species and S. aqueum, the largest species in relation to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exotic fruit tree; Palynology; Pollen grains; Stigma; Syzygium.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000600202

Vegetational changes during the last millennium inferred from a palynological record from the Bananal Island, Tocantins, Brazil
Provedor de dados: 36
Autores: MENDES,Laís Aguiar da Silveira; PIRES,Etiene Fabbrin; MENESES,Maria Ecilene Nunes da Silva; BEHLING,Hermann.
The Bananal Island is regarded the largest fluvial island in the world, bounded by Araguaia and Javaés rivers, being located in southwest of Tocantins. The objectives of this work were to provide information about the vegetational changes that occurred at the Bananal Island, in order to contribute to the understanding the dynamics of past and current savanna and areas of ecotones with forests. Thus, a sedimentary core collected from a small lake at the Bananal Island plain was submitted to pollen and radiocarbon dating analyses. The results showed that the last millennium was dominated by forest reflecting a wet climate. At the beginning of the record (920-770 yr cal BP) the wet climate and high rainfall produced flooding during long rainy seasons that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floodplain; Late Holocene; Palynology.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000200215

First pollen survey of murundus in the Chapada Diamantina region of the state of Bahia, Brazil
Provedor de dados: 39
Autores: Oliveira,Paulino Pereira; Funch,Roy Richard; Santos,Francisco de Assis Ribeiro dos.
This was a pollen survey, in which we analyzed the sediments and moss polsters of murundus (termite mounds) in the Chapada Diamantina region of the state of Bahia, Brazil. Palynological treatment revealed the presence of 53 pollen types in murundus sediments, of which 23 were related to plants in the semi-arid zone and 30 remained unidentified. In moss polster samples, the pollen assemblage comprised 42 pollen types for which taxonomic affinities were identified and 54 for which they were not. In our comparison of the two pollen assemblages, we found that moss polsters and murundu sediments shared 15 pollen types. For some of the pollen grains in the murundus sediments, it was not possible to make reliable interpretations because of small number of grains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Moss polsters; Pollen trap; Pollen grains.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400019

Pollen morphology of Waltheria L. (Malvaceae-Byttnerioideae) from Bahia, Brazil
Provedor de dados: 39
Autores: Silveira Júnior,Cristiano Eduardo Amaral; Lima,Luciene Cristina Lima e; Saba,Marileide Dias.
ABSTRACT Waltheria encompasses about 60 species distributed in Brazil and Mexico. To improve the palynology of the genus, we analyzed 14 species occurring in the Brazilian State of Bahia. Pollen grains were acetolyzed and examined using light microscopy and scanning electron microscopy. Non-acetolyzed pollen grains were viewed by transmission electron microscopy. The results revealed two general pollen types based on exine ornamentation, such as reticulate and echinate, which are distinct with regard to (1) size and shape, (2) apertural type and number, (3) relative length of ectoapertures, and (4) thickening of the nexine compared to the sexine. An ultrastructural analysis of the pollen wall revealed a continuous foot layer and a compact and discontinuous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heterostyly; Palynology; Ultrastructure; Taxonomy; Waltheria.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400597

Plant succession in a forest on the Lower Northeast Slope of Serra Geral, Rio Grande do Sul, and Holocene palaeoenvironments, Southern Brazil
Provedor de dados: 39
Autores: Leal,Márcia Grala; Lorscheitter,Maria Luisa.
The study of plant succession provides information on vegetation dynamics of a region and, therefore, improves our understanding of the natural trends of present ecosystems. With this objective, plant succession based on palynology of a sediment profile in a swamp forest was studied on the Lower Northeast Slope of Serra Geral, Rio Grande do Sul. Samples were treated with HCl, HF, KOH and acetolysis; slides were mounted in glycerol-jelly. For each sample a minimum of 500 grains of pollen + pteridophyte and bryophyte spores was counted and other palynomorphs were counted in parallel. Tilia and Tilia Graph software were used to construct percentage and concentration diagrams, with three 14C datings. The results show a local water reservoir in the beginning of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Palaeoecology; Plant migration; Quaternary; South America.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000100001

Pollen morphology of selected species of the subfamily Bombacoideae (Malvaceae sensu lato)
Provedor de dados: 39
Autores: Abreu,Vanessa Holanda Righetti de; Mendonça,Claudia Barbieri Ferreira; Gonçalves-Esteves,Vania.
We analyzed the pollen grains of 11 species within the subfamily Bombacoideae. The pollen grains were acetolyzed, after which they were analyzed and photographed under light microscopy. Unacetolyzed pollen grains were analyzed and photomicrographed under scanning electron microscopy. We studied pollen characters such as shape, size, exine ornamentation and aperture type. The species were separated by a pollen key, which considers the presence or absence of "calotte" in the pollen grains. This attribute separated Ceiba and Eriotheca from the other genera. Some species are differentiated by specific characters: in Bombacopsis glabra and B. stenopetala, the sexine is rugulate or "vermiculate" with isolated pilate elements; in B. calophylla, the pollen grains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Bombacoideae; Palynology; Rio de Janeiro.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300007

Late Quaternary vegetation dynamics from central parts of the Madeira River in Brazil
Provedor de dados: 39
Autores: Feitosa,Yuri Oliveira; Absy,Maria Lúcia; Latrubesse,Edgardo Manuel; Stevaux,José Cândido.
The present study reconstructs the paleovegetation of a varzea (seasonally flooded) forest in the central parts of the Madeira River floodplain in Brazil using palynological data. Forty-nine cut-bank sediment samples from the Madeira River were processed in the study; from these, ten samples contained pollen: two contained pollen from the Middle Pleniglacial age, one contained pollen from the Tardiglacial age, six contained pollen from the Holocene, and one contained more recently deposited pollen. The Middle Pleniglacial pollen belonged to a primary succession varzea forest, while the Tardiglacial pollen represented a late succession varzea forest. On the other hand, the three Holocene samples showed the characteristic composition of chavascal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cut-bank sediment; Late Pleistocene-Holocene; Palynology; Southern Amazonian tributary; Varzea.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000100120

Pollen analysis of the post-emergence residue of Melipona (Melikerria) interrupta Latreille (Hymenoptera: Apidae) bred in the central Amazon region
Provedor de dados: 39
Autores: Ferreira,Marcos Gonçalves; Absy,Maria Lúcia.
We applied an "adapted" protocol for collecting and processing pollen grains in the pollen analysis of the post-emergence residue of Melipona (Melikerria) interrupta Latreille. The study was conducted at the Sant'Ana honey farm, located on the banks of the Solimões River, in the municipality of Manacapuru, in the state of Amazonas, Brazil, where a colony was monitored in October and November 2010. From that colony, 10 samples of post-emergence residue were collected. Unlike in the acetolysis method, there was no need to expose pollen grains to an acidic medium, because pollen loses its content during the larval digestive process. We identified 32 pollen types, from 19 botanical families, plus three undetermined pollen types. The most representative family...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stingless bees; Palynology; Pollen; Floral resources.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400009

Pollen grains in quaternary sediments from the Campos Basin, state of Rio de Janeiro, Brazil: Core BU-91-GL-05
Provedor de dados: 39
Autores: Freitas,Aline Gonçalves de; Carvalho,Marcelo de Araujo; Mendonça,Claudia Barbieri Ferreira; Gonçalves-Esteves,Vania.
Here, we describe pollen grains extracted from a Pleistocene-Holocene sediment core (BU-91-GL-05; 22°48'45"S; 41°54'13"W) taken from the Albacora Slope (22°48'45"S; 41°54'13"W), located in the Campos Basin of the northern region of the state of Rio de Janeiro, Brazil. The analysis resulted in the identification and morphological description of 46 types of pollen: one of a gymnosperm genus (Podocarpus); and 45 of angiosperm taxa across 27 families-one family of monocotyledons (Poaceae) and 26 families (30 types) of dicotyledons. The most common angiosperm families were Amaranthaceae (Chenopodium, Amaranthus and Gomphrena); Fabaceae (Fabaceae type, Bauhinia, Inga and Canavalia); Malpighiaceae (Tetrapteris, Heteropteris and Peixotoa); Malvaceae (Sida,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Pollen descriptions; Paleovegetation; Quaternary; Campos Basin.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400016

Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)
Provedor de dados: 39
Autores: Loeuille,BenoÎt; Souza-Souza,Raquel Maria Batista; Abreu,Vanessa Holanda Righetti; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vania.
In order to evaluate the significance of the pollen morphology for generic and infrageneric taxonomy of the genus Eremanthus (Vernonieae, Asteraceae), and to provide additional data for its phylogenetic reconstruction, the pollen of 20 of the 23 species of the genus was examined using light and scanning electron microscopy. Acetolysed pollen grains were measured, described, and illustrated using light microscopy, while non-acetolysed pollen grains were analyzed using scanning electron microscopy. Pollen grains of these species are isopolar, oblate-spheroidal in most of the species, more rarely prolate spheroidal or suboblate, subtriangular amb, tricolporate and subechinolophate. The variation among quantitative characters does not correlate with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lychnophorinae; Compositae; Taxonomy; Palynology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000100006

Pollen morphology of Menispermaceae in the state of Bahia, Brazil
Provedor de dados: 39
Autores: Teixeira,Michella Del Rei; Amorim,André Márcio; Santos,Francisco de Assis Ribeiro dos.
There have been few palynological studies of the family Menispermaceae. Here, we analyzed the pollen grains of 12 species from seven genera of Menispermaceae occurring in the state of Bahia, Brazil: Abuta selloana Eichl.; Borismene japurensis (Mart.) Eichl.; Chondrodendron microphyllum (Eichl.) Moldenke; C. platyphyllum (A.St.-Hil.) Miers; Cissampelos andromorpha DC.; C. ovalifolia DC.; C. pareira L.; C. sympodialis Eichl.; Hyperbaena domingensis (DC.) Benth.; Odontocarya duckei Barneby; Sciadotenia campestris Barneby; and S. pubistaminea (K. Schum.) Diels. The pollen grains were acetolysed, measured, described, and illustrated using light and scanning electron microscopy. The pollen grains were found to be small, oblate spheroidal or prolate spheroidal,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Taxonomy; Stenopalynous.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200016

Pollen morphology of Rubiaceae Juss. species occurring in an area of caatinga (dryland) vegetation in Bahia State, Brazil
Provedor de dados: 39
Autores: Silveira Júnior,Cristiano Eduardo Amaral; Saba,Marileide Dias; Jardim,Jomar Gomes.
The palynology of the following 16 species of Rubiaceae, from Brejinho das Amestistas, was investigated: Coccocypselum hirsutum Bartl. ex DC., Cordiera rigida Kuntze, Coutarea hexandra K.Schum., Declieuxia fruticosa Kuntze, Diodella apiculata (Willd. ex Roem. &amp;amp; Schult.) Delprete, D. radula (Willd. ex Roem. &amp;amp; Schult.) Delprete, D. teres Small., Emmeorhiza umbellata K.Schum., Leptoscela ruellioides Hook. f., Mitracarpus baturitensis Sucre., Mitracarpus villosus Cham. &amp;amp; Schltdl., Palicourea rigida Kunth, Psyllocarpus asparagoides Mart., Richardia grandiflora Steud., Staelia aurea K. Schum., and Staelia galioides DC. The pollen grains were acetolysed to and their morphological characters were analyzed using light and scanning electron...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gentianales; Pollen grains; Palynology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200020

Spore diversity among species of Blechnaceae in the Atlantic Forest
Provedor de dados: 39
Autores: Silva,Dilma Melo da; Sylvestre,Lana da Silva; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vania.
ABSTRACT The palynological diversity of Blechnaceae in the Atlantic Forest was investigated. While the monophyletic family belongs to the group of leptosporangiate ferns, a new classification proposed by recent phylogenetic study reorganizes the family and adds new genera. To expand palynological knowledge of the group, the spore morphology of 23 species and a hybrid, distributed among 10 genera, was described. Material from herbarium collections were submitted to acetolysis and mounted on slides, with subsequent statistical analysis of spore measurements. Photomicrographs of the material were taken under both light and scanning electron microscopy. Perine ornamentation varied among psilate, rugulate and scabrate; granules and gemmae were present along...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Austroblechnum; Blechnum; Spore; Multivariate analysis; Palynology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300412

Miocene fern spores and pollen grains from the Solimões Basin, Amazon Region, Brazil
Provedor de dados: 39
Autores: Sá,Natália de Paula; Carvalho,Marcelo de Araújo.
ABSTRACT This work documents fern spores and pollen grains (miospores) recovered from rocks of the Solimões Formation (Solimões Basin), their botanical affinities, ecology and distribution in the Miocene of the Amazon Region. The assemblage of miospores is well preserved and diverse. They are identified, illustrated and assigned to the ten families of ferns and 22 families of spermatophytes. All miospores were identified to the taxonomic level of species except for two taxa (Perinomonoletes and Podocarpidites). The families Pteridaceae and Arecaceae were most representative of ferns and spermatophytes, respectively. This work contributes to the knowledge of the paleoflora and will aid in paleoenvironmental, paleoecological and biostratigraphic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Miocene; Miospores; Neogene; Palynology; Solimões; Vegetation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400720

Pollen morphology of Centaurea L. (Asteraceae) in Iran
Provedor de dados: 39
Autores: Shabestari,Elaheh Sadat Bagheri; Attar,Farideh; Riahi,Hosein; Sheidai,Masoud.
The genus Centaurea L. is one of the largest genera in the family Asteraceae. The number of taxa included in this genus ranges from 500 to 600 worldwide. Iran is one of the major centers of diversity for this genus. Pollen morphology has proved useful in the systematics of Asteraceae, as well as in that of some of its genera and species. The pollen morphology of 19 taxa of the genus Centaurea was investigated in detail by light and scanning electron microscopy. Examination under light microscopy showed pollen grains to be tricolporate, isopolar, radially symmetrical, oblate spheroidal, prolate spheroidal, subprolate, tectum perforate and scabrate. Based on the exine ornamentation observed under scanning electron microscopy, we identified two types of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Centaurea; Palynology; Exine ornamentation; Light microscopy; Scanning electron microscopy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400004

Pollen morphology of some species of Spermacoceae s.s. (Rubiaceae) of the Atlantic Forest, Rio de Janeiro, Brazil
Provedor de dados: 39
Autores: Gonçalves-Esteves,Vania; Vieira,Gabrielle Reboredo Menezes; Carvalho,Renata Jacomo Paixão de; Crespo,Sonia Regina de Melo; Mendonça,Claudia Barbieri Ferreira.
ABSTRACT This work aimed to morphologically characterize 22 species of Spermacoceae s.s found in the Atlantic Forest in the state of Rio de Janeiro with the purpose of improving palynological knowledge of the studied species. The studied species included six species of Borreria and Denscantia cymosa, Emmeorhiza umbellata, Hexasepalum apiculatum, H. radula, H. teres, Manettia fimbriata, Mitracarpus eichleri, M. frigidus, M. hirtus, M. lhotzkyanus, M. megapotamicus, Oldenlandia salzmannii, Pentodon pentandrus, Richardia brasiliensis, Richardia scabra and Spermacoce rubescens. Acetolysed pollen grains were analyzed using light (LM) and scanning electron miscroscopy (SEM). The pollen grains varied in size (polar diameter) from medium to large, with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gentianales; Multivariate analysis; Palynology; Rubioideae; Systematics.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000200243

Complex sporoderm structure in bryophyte spores: a palynological study of Erpodiaceae Broth.
Provedor de dados: 39
Autores: Luizi-Ponzo,Andrea Pereira; Silva-e-Costa,Juliana da Costa.
ABSTRACT Palynological studies of bryophytes are critical for evaluating the taxonomic relevance of their spores. They also provide important support to paleoecological investigations that, usually, treat bryophytes as a whole, which does not permit the evaluation of specific functional traits of a special taxonomic unit. The present study investigated the morphology and ultrastructure of spores of five species of Erpodiaceae (Bryophyta), and assessed the implications for taxonomy and the recognition of spores of past records. Erpodiaceae includes corticolous and saxicolous plants that are widely distributed throughout tropical and temperate regions. The spores were found to be isomorphic and apolar with a subcircular amb, granulate, inaperturate. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryophytes; Mosses; Palynology; Spore; Sporoderm; Ultrastructure.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100141

Palynotaxonomy of Brazilian species of Passifloraceae sensu stricto
Provedor de dados: 39
Autores: Araújo,Rita de Cássia Matos dos Santos; Nunes,Teonildes Sacramento; Saba,Marileide Dias; Andrade,Brunelle Ramos; Nascimento,Anacleide Pereira do; Santos,Francisco de Assis Ribeiro dos.
ABSTRACT This study aims to expand knowledge of the pollen morphology of Passifloraceae and contribute to the taxonomic delimitation of the group by morphologically characterizing pollen grains of species that occur in the Brazilian state of Bahia. Thirty-six species occur in the state, one of the genus Mitostemma (M. glaziovii) and 35 of the genus Passiflora. Pollen samples were acetolysed, measured, and described using light and scanning electron microscopy. The results group the studied species into four pollen types based mainly on aperture type and number, opercular variation, and the presence/absence of ornamentation elements inside the lumina of the reticulum: Pollen type I - species belonging to the subgenera Astrophea and Deidamioides; pollen type...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Mitostemma; Passiflora; Palynology; Pollen morphology; Taxonomy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100054

Pollen morphology of the genera Irlbachia, Tachia, Voyria and Voyriella (Gentianaceae Juss.) found in the Reserva Florestal Adolpho Ducke (Amazonas, Brazil)
Provedor de dados: 39
Autores: Ferreira,Marcos Gonçalves; Absy,Maria Lúcia; Gonçalves-Esteves,Vânia.
A pollen morphology study of the Gentianaceae Juss. of Reserva Florestal Adolpho Ducke (Manaus, Brazil) was performed. The pollen grains of the studied species varied morphologically in their pollen units (tetrads or monads), size (small, medium and large), shape (oblate, suboblate, oblate spheroidal, spheroidal, prolate spheroidal and prolate), polarity (heteropolar, isopolar or subisopolar), symmetry (bilateral or radial) and number and type of aperture (3-colporate and 1-3porate). In relation to ornamentation, pollen grains had a sexine that was psilate in the Voyria species, microreticulate in Voyriella parviflora and reticulate heterobrochate in Tachia grandiflora and Irlbachia alata. The exine in I. alata showed great variability in the size and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon forest; Neotropical species; Palynology; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000400020

The systematic value of pollen morphology in trees and shrubs species of Bauhinia L. (Caesalpinioideae- subg. Bauhinia - sect. Pauletia) occurring in Brazil
Provedor de dados: 39
Autores: Moreira,Fábio de França; Vaz,Ângela Maria Studart da Fonseca; Mendonça,Claudia Barbieri Ferreira; Gonçalves-Esteves,Vania.
We analyzed the pollen grains of 30 taxa of the genus Bauhinia L., within five series: Aculeatae (9 species); Acuminatae (1 species); Cansenia (17 species); Pentandrae (2 species); and Perlebia (1 species). The pollen grains were acetolysed, after which they were photographed and analyzed under light microscopy. Non-acetolysed pollen grains were analyzed under scanning electronic microscopy. Characters such as shape, size, exine and aperture constitution were studied. The species were separated by a dichotomous key, which showed pollen grains that were classified as very large; isopolar or apolar; oblate, suboblate, oblate spheroidal or spherical; large or small in terms of the polar area; inaperturate, 3-porate or (3-7)-colpate; and microreticulate or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bauhinia; Brazil; Leguminosae; Palynology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200014

Pollen morphology of species of Graphistylis B. Nord. (Asteraceae) of Brazil
Provedor de dados: 39
Autores: Souza,Mariana Albuquerque de; Mendonça,Claudia Barbieri Ferreira; Esteves,Roberto Lourenço; Gonçalves-Esteves,Vania.
This paper presents the results of a palynological study of the species ofGraphistylis that were segregated fromSenecio (s.l.) (Seneciosect. Dichroa) and that are all endemic of Brazil. These species are found in mountainous regions of the states of Espirito Santo, Minas Gerais, Paraná, Rio de Janeiro, São Paulo and Santa Catarina. The pollen grains of eight species were acetolyzed and analyzed and photographed using light microscopy. Unacetolyzed pollen grains were analyzed and photomicrographed using scanning electron microscopy. The current study undertook a palynologically analysis of Graphistylis in order to obtain information useful for making a better ranking of these genus. The results show medium-sized pollen grains that were oblate spheroidal or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Ordination analysis; Palynology; Pollen grains; Senecioneae.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100138

The presence of Fabaceae in the pollen profile of propolis produced in northeastern Brazil
Provedor de dados: 39
Autores: Avelino,Luciano Oliveira; Santos,Francisco de Assis Ribeiro dos.
ABSTRACT Propolis is a resin-like substance composed mainly of resin, wax, essential oils, pollen grains and specific plant parts collected by the honeybee Apis mellifera, which mixes them with fluids they secrete. The components and chemical properties of propolis vary among regions. Therefore, in order assess variation in the botanical composition of propolis, 26 samples of propolis (brown, red, and green) produced throughout northeastern Brazil were analyzed by acetolysis specifically adapted for propolis. In total, 196 pollen types were recorded, representing 123 genera and 47 families, with types of Fabaceae and Rubiaceae being present in 100 % of the samples. Fabaceae was the richest group with 49 pollen types, followed by Malvaceae (10 types),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apiculture; Apis mellifera; Beekeeping; Palynology; Pollen grains.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400602

Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?
Provedor de dados: 39
Autores: Passarella,Marcella de Almeida; Luizi-Ponzo,Andrea Pereira.
ABSTRACT Amphidium Schimp. is characterized by cushion-forming erect primary stems, linear-lanceolate leaves, and gymnostome capsules. The phylogenetic position of Amphidium is uncertain, with the genus having been variously included in Zygodontaceae Schimp., Rhabdoweisiaceae Limpr., Orthotrichaceae Arn. and Amphidiaceae M. Stech. A palynological investigation was performed of the three species of the genus that occur in the Americas: Amphidium lapponicum (Hedw.) Schimp., Amphidium mougeotii (Bruch &amp; Schimp.) Schimp., and Amphidium tortuosum (Hornsch.) Cufod. Spores were observed and measured for greatest diameter under light microscopy both before and after acetolysis. Non-acetolyzed spores were observed under scanning electron microscopy to assess...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphidiaceae; Bryophytes; Haplolepidous moss; Palynology; Spores.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100135

Spores of Plagiochila (Dumort.) Dumort.: the taxonomic relevance of morphology and ultrastructure
Provedor de dados: 39
Autores: Silva-e-Costa,Juliana da Costa; Luizi-Ponzo,Andrea Pereira.
ABSTRACT Plagiochilaceae is a family of leafy liverworts that are distributed worldwide. It is of great importance due to its taxonomic and ecological implications among bryophytes. Most species of the family belong to the genus Plagiochila, but there is no consensus regarding its infrageneric circumscription. There have been few palynological studies involving Plagiochilaceae and Plagiochila. Here, we describe the spore morphology of seventeen species of Plagiochila and discuss the taxonomic value of palynological characters for these taxa. The spores were processed by standard palynological techniques and analyzed using light and electron microscopy. The spores were found to be apolar, spheroidal, released monads that vary in size from 13µm to 58µm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryophytes; Liverworts; Morphology; Palynology; SEM; Taxonomy; TEM; Ultrastructure.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300391

Morphological characterization of pollen grains of Brazilian species of Bombacoideae (Malvaceae s.l.)
Provedor de dados: 39
Autores: Saba,Marileide Dias; Esteves,Gerleni Lopes; Santos,Valdira de Jesus; Santos,Francisco de Assis Ribeiro dos.
ABSTRACT The pollen grains of 15 species belonging to five genera (Ceiba Mill., Eriotheca Schott &amp; Endl., Pachira Aubl., Pseudobombax Dugand, and Rhodognaphalopsis A. Robyns) of the subfamily Bombacoideae (Malvaceae s.l.) were acetolysed, measured, described and photomicrographed under light microscopy and scanning and transmission electron microscopy, in order to characterize the pollen morphology of species of the subfamily occurring in Brazil. The pollen characters studied were size, shape, exine constitution, and apertural type. Pollen grains were medium to large-sized and isopolar with a (sub)circular and (sub)triangular amb with flat, convex or concave sides; oblate to suboblate; 3(-4)-colp(or)ate or 4-5(-6)-colporate, planaperturate,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceiba; Pachira; Palynology; Pseudobombax; SEM; TEM.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100094

Pollen diversity in selected species of the tribe Chironieae (Gentianaceae Juss.) that occur in the Atlantic Forest, Brazil
Provedor de dados: 39
Autores: Sousa,Hian Carlos Ferreira de; Gonçalves-Esteves,Vania; Mendonça,Cláudia Barbieri Ferreira.
ABSTRACT Based on molecular data, the tribe Chironieae (Gentianaceae) is divided into three subtribes. This study aims to describe the pollen morphology of representatives of two of the three subtribes that occur in the Atlantic Forest in order to contribute to a better understanding of the palynology of these taxa and to clarify the taxonomy of the family: subtribe Chironiinae (Centaurium erythraea and Zygostigma australe) and subtribe Coutoubeinae (Coutoubea ramosa, C. spicata, Deianira chiquitiana, D. damazioi, D. erubescens, D. nervosa and D. pallescens). Botanical material was obtained from exsicates and treated by acetolysis for light microscopy. Pollen grains were measured and photomicrographed, and the results statistically analyzed. For SEM study,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chironiinae; Coutoubeinae; Morphology; Palynology; Pollen grains.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100120

Palynomorph assemblages of the Cuayuca Formation (Paleogene), Puebla, southern Mexico. Part 1: trilete spores, monolete spores and gymnosperm pollen
Provedor de dados: 41
Autores: Ramírez-Arriaga,Elia; Martínez-Hernández,Enrique; Prámparo,Mercedes B.
This publication presents the systematics of monolete and trilete spores, and polyplicate, inaperturate and bisaccate pollen grains recovered from outcrops of the Cuayuca Formation, State of Puebla, southern Mexico. Species belonging to the following genera are described and illustrated: Cicatricosisporites, Deltoidospora, Foveotriletes, Leptolepidites, Lusatisporis, Retitriletes, Stereigranisporis, Verrucingulatisporites, Polypodiisporites, Pinuspollenites, Pityosporites, Ephedripites , and Cupressacites . Pteridophytes and bryophytes spores constitute 13.5% of the assemblages and gymnosperms 7.3%. Angiosperms, to be discussed on later papers, dominate the assemblage.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Systematic descriptions; Tertiary; Cuayuca Formation; Paleogene; Mexico.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000300005

Palynology of the Chigua (Devonian) and Malimán (Carboniferous) formations in the Volcán Range, San Juan Province, Argentina: Part I. Paleomicroplankton and acavate smooth and ornamented spores
Provedor de dados: 41
Autores: Amenábar,Cecilia R.; Di Pasquo,Mercedes; Carrizo,Hugo A.; Azcuy,Carlos L.
Palynological analysis of the Chigua and Malimán formations of Devonian and Early Carboniferous age respectively, cropping out in the Río Blanco Basin, northwestern Argentina, has yielded diverse paleomicroplankton-spore assemblages. In this first part, 35 species of paleomicroplankton and 68 species of acavate spores from both formations are illustrated. Two new species are proposed: Apiculiretusispora laxa from the Devonian, and Pustulatisporites malimanensis from the Early Carboniferous. Two new combinations are proposed: the spore species Apiculatisporis castanea (Butterworth and Williams) nov. comb., and the paleomicroplankton species, Dictyotidium munificum (Wicander and Wood) nov. comb., based on the discussion of the main characters of the genera...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Chigua and Malimán formations; Middle Devonian and Early Carboniferous; San Juan Province; Argentina.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000200007

Systematic palynological study of the Cortaderas Formation, (Mississippian) Río Blanco Basin, Argentina: Part Two
Provedor de dados: 41
Autores: Pérez Loinaze,Valeria.
Well preserved Mississippian palynological assemblages have been obtained from the Cortaderas Formation in the Río Blanco Basin, northwestern Argentina. In this second contribution, twenty- eight from a total of seventy-eight spore species are described. A new species of trilete spores is proposed: Densosporites scalabrinii sp. nov. Worldwide geographic and stratigraphic records of taxa are analysed. The Cortaderas Formation is dated as late Viséan in age based on the presence of species of potential stratigraphic relevance, such as Reticulatisporites magnidictyus Playford and Helby, Verrucosisporites quasigobbettii Playford and Helby and Rugospora australiensis (Playford and Helby) Jones and Truswell and the absence of pollen grains. The samples collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Cortaderas Formation; Mississippian; Palynology; Systematics.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200014

Some trilete spores from Lower Carboniferous strata of the Rio Blanco Basin, western Argentina
Provedor de dados: 41
Autores: Pérez Loinaze,Valeria.
A new miospore genus Ductilispora is described to accommodate simple acamerate miospores, which have a distal ornament of folds like muri or thickenings. Five new species of trilete spores are defined: D. circularis sp. nov., D . longitudinalis sp. nov., D. corrugatus sp. nov., Verrucosisporites cortaderensis sp. nov., Dibolisporites malimanensis sp. nov. and Indotriradites variabilis sp. nov. The specimens have been recovered from the Malimán and the Cortaderas Formations (Early Carboniferous), in La Cortadera creek, San Juan province, Argentina.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Cortaderas Formation; Malimán Formation; Lower Carboniferous; San Juan; Argentina.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200017

Palynology of the Las Curtiembres Formation (Late Cretaceous, Salta Group Basin), Las Conchas Creek area, northwestern Argentina
Provedor de dados: 41
Autores: Narváez,Paula L.; Sabino,Ignacio F.
This study provides the first palynologic record of the Las Curtiembres Formation (Late Cretaceous, Salta Group Basin) in northwestern Argentina. Two palynologically productive samples were obtained from the Morales Member in the area of the Las Conchas creek, Salta Province. Nineteen morphospecies are recorded for the Formation. The samples show poor preservation of the specimens and low diversity. The palynomorph association is characterized by the prevalence of species that belong to the Ephedraceae (6 species with 57% of total abundance), possibly suggesting semiarid conditions and a warm-dry paleoclimate at the time of deposition. Low humidity could also be inferred from the low abundance and diversity of pteridophyte species and the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Late Cretaceous; Las Curtiembres Formation; Salta Group Basin.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200017

Systematic palynological study of the Cortaderas Formation, (Mississippian) Río Blanco Basin, Argentina: Part One
Provedor de dados: 41
Autores: Pérez Loinaze,Valeria.
Well preserved Mississippian palynological assemblages have been obtained from the Cortaderas Formation in the Río Blanco Basin, northwestern Argentina. The geological setting and stratigraphic provenance of the samples is provided. In this first part, fifty-two species are described from a total of seventy-eight species of spores recognized. Five new species are proposed: Verrucosisporites incompositus sp. nov., Verrucosisporites perbrevis sp. nov., Anapiculatisporites exiguus sp. nov., Anapiculatisporites expolitus sp. nov. and Dibolisporites insolitus sp. nov. Previous worldwide geographic and stratigraphic records of taxa are detailed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Cortaderas Formation; Mississippian; Palynology; Systematics.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000100003

New palynological data from the Malanzán Formation (Carboniferous), La Rioja Province, Argentina
Provedor de dados: 41
Palynological analysis of the Malanzán Formation in the Paganzo Basin, northwestern Argentina, has yielded six well-preserved palynological assemblages. Fifty-nine species were determined: 37 spores, 19 pollen grains, and 3 algae. Thirty-two of these species have not been recorded so far from the Malanzán Formation, and all pollen species are illustrated for the first time. These assemblages are referred to Sub-Biozone A of the Raistrickia densa-Convolutispora muriornata Biozone, Serpukhovian in age. Moreover, the abundance of monosaccate pollen grains might constrain the Malanzán Formation to the late Serpukhovian.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Malanzán Formation; Carboniferous; Palynology.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000300005

Palynological record of the Paso Flores Formation (Late Triassic) on the southeastern side of the Limay River, Patagonia, Argentina
Provedor de dados: 41
Autores: Zavattieri,Ana María; Mego,Natalia.
Well-preserved spore-pollen assemblages from the type locality of the Paso Flores Formation, in the Estancia Paso Flores area, on the southeastern side of the Limay River, northern Patagonia, Argentina, are presented in this contribution. In this area, the Paso Flores Formation is exposed along the boundary between the Río Negro and Neuquén provinces; it consists mainly of conglomerates, sandstones and mudstones and contains remains of the Dicroidium Flora. The facies associations suggest gravelly to sandy braided river systems as the main depositional environments of the lower to middle sections of the unit outcropping in this region. The palynofloral assemblages contain 48 species of bryophytic and pteridophytic spores, 30 species of gymnospermous pollen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Upper Triassic; Paso Flores Formation; Patagonia; Argentina.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200018

Holocene sea-level change inferred from palynological data in the Beagle Channel, southern Tierra del Fuego, Argentina
Provedor de dados: 41
Autores: Borromei,Ana M.; Quattrocchio,Mirta.
An early-middle Holocene section in Bahía Lapataia (54º 50' S, 68º 34' W), Beagle Channel, Tierra del Fuego, Argentina has been examined taking into account its sporomorphs and organic-walled microplankton. The palynological assemblage suggests nearshore environments. Two relatively higher sea levels were identified by the increased abundance of organic-walled dinoflagellate cysts (Brigantedinium spp., Selenopemphix sp., Operculodinium centrocarpum sensu Wall and Dale, Spiniferites spp.), the acritarch Halodinium sp. and zoomorph remains (test linings of foraminifera and copepod egg-envelopes). The littoral vegetation at the time of the marine incursion was mainly arboreal, as can be seen in the pollen records by significant increase in Nothofagus dombeyi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Paleoenvironment; Holocene transgression; Bahía Lapataia; Beagle Channel; Tierra del Fuego; Argentina.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100011

Palynology and paleoenvironmental significance of the Tunal Formation (Danian) at its type locality, El Chorro creek (Salta, Argentina)
Provedor de dados: 41
Autores: Volkheimer,Wolfgang; Novara,Martín G.; Narváez,Paula L.; Marquillas,Rosa A.
The palynologic investigation of samples from the Tunal Formation at El Chorro creek (Salta, Argentina) resulted in the recovery of terrestrial assemblages of pollen and spores associated with freshwater algae (Pediastrum spp. and Scenedesmus sp.). Of the 43 species of sporomorphs identified for the Tunal Formation so far, 28 species are cited here for the first time. The spores and pollen indicate a Danian age at the type locality. Sedimentary proxidata including abundant evaporites suggest intervals of at least seasonal arid environmental conditions. In contrast, the palynologic assemblages recovered from the organic rich dark shales indicate the presence of swampy areas and forests surrounding them. The dominance of Verrustephanoporites simplex...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Paleoenvironment; Paleogene; Danian; Tunal Formation; Salta Group Basin; Argentina.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000300005

Palynology of the Chigua (Devonian) and Malimán (Carboniferous) formations in the Volcán Range, San Juan Province, Argentina: Part II. Cavate, pseudosaccate and cingulizonate spores
Provedor de dados: 41
Autores: Amenábar,Cecilia R.; Di Pasquo,Mercedes; Carrizo,Hugo A.; Azcuy,Carlos L.
Palynological analysis of the Chigua and Malimán formations of Middle Devonian and Mississippian age respectively, is presented. They crop out in the Del Volcán Range at the Río Blanco Basin in western Argentina. In this second part, 40 indigenous species of cavate, pseudosaccate and cingulizonate spores from both units are illustrated. The species Geminospora sp. cf. G. tuberculata var. tuberculata McGregor is recorded in the Middle Devonian of South America for the first time. The following species are also recorded in the Mississippian of South America for the first time as Crassispora invicta Playford, Densosporites asperus Braman and Hills, Densosporites gracilis Smith and Butterworth, Densosporites secundus Playford and Satterthwait, Densosporites...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Chigua Formation; Malimán Formation; Middle Devonian; Mississippian; San Juan Province; Argentina.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000300005

Pollen analysis of Holocene sediments from the Poço das Antas National Biological Reserve, Silva Jardim, Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Coelho,Luciane G.; Barth,Ortrud M.; Araujo,Dorothy S.D. de.
The Poço das Antas National Biological Reserve is located in Rio de Janeiro State, southeast Brazil. This paper presents information on past environmental characteristics of the area through pollen analysis. Two sedimentary columns were collected and five samples were selected for radiocarbon dating. The following ages of the columns from bottom to top were detected: column 1 - 1.20-1.16 m: 6080 ±40 years BP, 0.775-0.735 m: 4090 ±40 years BP, 0.385-0.345 m: 1880 ±80 years BP; column 2 - 1.22-1.18 m: 3520 ±40 years BP, 0.23-0.19 m: 1810 ±40 years BP. Three samples from column 1 and two samples from column 2 were selected for pollen analysis: 1.20 m, 0.77 m and 0.37 m of column1 and 1.22 m and 0.21 m of column 2. Chemical treatment followed standard...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Paleo-environment; Holocene; Brazil.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300013

Biostratigraphy and paleoecology of an unusual palynological record from the Aquidauana Formation, Late Pennsylvanian of Paraná Basin
Provedor de dados: 42
Autores: Souza,Paulo A.; Perinotto,José A.J.; Félix,Cristina M.; Araújo,Bruno C.
The Aquidauana Formation is a Permo-Carboniferous sedimentary unit, widely stratigraphicaly distributed in the northwestern and northern portions of the Paraná Basin. However, little paleontological data is available from this formation, preventing accurate biostratigraphic and paleoecological interpretations. An abundant, diversified and well preserved assemblage of palynomorphs was recognized from sampling conducted in an outcrop section in Cipolândia District of Aquidauana Municipality, state of Mato Grosso do Sul, Brazil. A total of 35 indigenous palynomorph taxa was recognized, comprising 6 species of spores (related to 5 genera), 28 species of pollen grains (14 genera) and 1 species of chlorophycean algae. Monosaccate pollen grains are exceptionally...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biostratigraphy; Paleoecology; Palynology; Pennsylvanian.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200611

Pollen grain morphology of Fabaceae in the Special Protection Area (SPA) Pau-de-Fruta, Diamantina, Minas Gerais, Brazil
Provedor de dados: 42
Autores: LUZ,CYNTHIA F.P. DA; MAKI,ERICA S.; HORÁK-TERRA,INGRID; VIDAL-TORRADO,PABLO; MENDONçA FILHO,CARLOS VICTOR.
The presented paper considered the pollen morphology of thirteen species belonging to seven genera of the Fabaceae family occurring in the Pau-de-Fruta Special Protection Area (SPA), Diamantina, state of Minas Gerais, Brazil. The pollen grains of six species ofChamaecrista [C. cathartica (Mart.) H.S. Irwin &amp; Barneby, C. debilis Vogel, C. flexuosa (L.) Greene, C. hedysaroides (Vogel) H.S. Irwin &amp; Barneby, C. glandulosa (L.) Greene, and C. papillata H.S. Irwin &amp; Barneby] have a similar morphology, characterized by three long colporated apertures with a central constriction. The species share specific morphological features regarding pollen size, endoaperture type (circular, lalongate or lolongate) and SEM ornamentation patterns of the exine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Espinhaço Southern Mountain Range; Fabaceae; Palynology; Pollen morphology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401329

Paleoenvironmental evolution of the coastal plain of Southern Brazil: palynological data from a Holocene core in Santa Catarina State
Provedor de dados: 42
Autores: KUHN,LIDIA A.; SOUZA,PAULO A.; CANCELLI,RODRIGO R.; SILVA,WAGNER G.; MACEDO,RENATO B.
ABSTRACT This paper presents a paleoenvironmental reconstruction from palynological analyses of a sedimentary core of Holocene age, drilled at municipality of Garopaba (Santa Catarina), Southern Brazil. A total of 46 samples was collected for palynological analyses in the 450 cm-long core PCSC-3, as also three samples for radiocarbon dating and granulometric analyses. The palynological content includes 84 taxa related to pollen grains of angiosperms (38) and gimnosperm (3), spores of pteridophyta (16) and bryophyta (2), spores of fungi (8), algae (3), acritarchs (3), dinoflagellate cysts (2) and microforaminiferal linings (1). Three specimens of acritarchs are described and illustrated in detail. Three palynological phases were defined based on changes in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal plain; Environmental evolution; Holocene; Palynology; Santa Catarina.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602581

Analysis of pollen load based on color, physicochemical composition and botanical source
Provedor de dados: 42
Autores: Modro,Anna F.H.; Silva,Izabel C.; Luz,Cynthia F.P.; Message,Dejair.
Pollen load samples from 10 hives of Apis mellifera (L.) were analyzed based on their physicochemical composition and botanical source, considering color as a parameter for quality control. In seven samples it was possible to establish the occurrence of more than 80% of a single pollen type, characterizing them as unifloral but with protein content variation. One of the samples was exclusively composed of saprophytic fungi (Cladosporium sp.). Comparing the mean results of the fungi loads with those of the nutritional components of pollen load, the former presented higher protein, mineral matter and dry matter and lower organic matter, ethereal extract and total carbohydrate values. The monochromatic samples met the physicochemical specifications regulating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Bees; Food source; Nutritional analysis; Palynology.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200014

Modern processes of palynomorph deposition at lakes of the northern region of the Rio de Janeiro State, Brazil
Provedor de dados: 42
Autores: Luz,Cynthia F.P. da; Barth,Ortrud M.; Silva,Cleverson G.
Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae deposition; Campos dos Goitacazes municipality; Palynology; Pollen deposition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300016

New Holocene pollen records from the Brazilian Caatinga
Provedor de dados: 42
Autores: MEDEIROS,VANDA B. DE; OLIVEIRA,PAULO E. DE; SANTOS,RUDNEY A.; BARRETO,ALCINA M.F.; OLIVEIRA,MARCELO A.T. DE; PINAYA,JORGE L.D.
Abstract We present two pollen diagrams from the semi-arid Caatinga of the Catimbau National Park, in Pernambuco and from a Mauritia palm forest in the Caatinga/Cerrado ecotone of southern Piauí, NE Brazil, spanning the last 10,000 cal. yrs BP and the last 1,750 cal yrs BP, respectively. These two records contain a signature of the local vegetation and permit the correlation of the pollen signal with regional climatic changes. The Catimbau record shows Zizyphus sp., a typical Caatinga taxon, in all three pollen zones indicating regional Caatinga vegetation and the predominance of local arboreal taxa adapted to high humidity from 10,000 to ca. 6,000 cal. yrs BP with a gradual tendency towards drier conditions revealed by a deposition hiatus between 6,000 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleoclimatology; Palynology; Pernambuco; Piauí; Caatinga vegetation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502011

Progress on the palynostratigraphy of the Permian strata in Rio Grande do Sul State, Paraná Basin, Brazil
Provedor de dados: 42
Autores: Souza,Paulo A.; Marques-Toigo,Marleni.
A review of published papers and results of analysis of new material have allowed improvements on the palynostratigraphy of the Permian strata of the Paraná Basin in Rio Grande do Sul State. Based on first and last occurrences of certain species of pollen taxa, two palynozones are formalized, these are the Vittatina costabilis and Lueckisporites virkkiae Interval Zones, in ascending order. The Vittatina costabilis Interval Zone is subdivided into two units, in ascending order the Protohaploxypinus goraiensis and the Hamiapollenites karrooensis Subzones, and is recognized from the glacial (Itararé Group) and post-glacial sequence (Rio Bonito Formation and the base of the Palermo Formation). The Lueckisporites virkkiae Interval Zone occurs from the uppermost...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Permian; Paraná Basin; Biostratigraphy; Rio Grande do Sul.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200012

Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
Provedor de dados: 42
Autores: GUIMARÃES,JOSÉ T.F.; SAHOO,PRAFULLA K.; SOUZA-FILHO,PEDRO W.M.; FIGUEIREDO,MARIANA M.J. COSTA DE; REIS,LUIZA S.; SILVA,MARCIO S. DA; RODRIGUES,TARCÍSIO M.
ABSTRACT Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows. At that time, montane savanna and forest formation were already established suggesting predominance of wet climate. However, from 7000 to 3000 cal yr BP, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Forest; Canga vegetation; Palynology; Carbon and nitrogen isotopes; Geochemistry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400502

Morphology and ultrastructure of megaspores and microspores of Isoetes sehnemii Fuchs (Lycophyta)
Provedor de dados: 42
Autores: Macluf,Cecilia; Morbelli,Marta; Giudice,Gabriela.
The morphology and wall ultrastructure of megaspores and microspores of Isoetes sehnemii that grows in Brazil were analyzed as part of the study of the Isoetaceae present in Southern South America. The observations were performed with light, scanning and transmission electron microscopes. The megaspores are trilete, 350-450μm in equatorial diameter. The surface is reticulate. In section, the sporoderm is 100μm thick including the ornamentation. The wall is composed of a siliceous perispore, which consists of short fused flatten, elements forming a three-dimensional mesh. The exospore has two zones of different structure. The endospore is fibrillar. The microspores are monolete, 21-27μm in equatorial diameter. The sporoderm is composed of a sporopollinic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycophyta; Isoetes; Brazil; Spores; Ultrastructure; Sculpture; Palynology.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200010

Palynological analysis of a late Holocene core from Santo Antônio da Patrulha, Rio Grande do Sul, Southern Brazil
Provedor de dados: 42
Autores: Macedo,Renato B.; Souza,Paulo A.; Bauermann,Soraia G.; Bordignon,Sérgio A.L.
A sedimentar core collected at Santo Antônio da Patrulha, Rio Grande do Sul State, southmost Brazil, was submitted to pollen analysis to provide the vegetational history of this region, and the paleoecological and paleoclimatic changes. A total of 98 taxa of palynomorphs was identified from 35 subsamples. Three radiocarbonic datings were obtained along a section of 115 cm depth, including the basal age of 4730 ± 50 yr BP. Pollen diagrams and cluster analysis were performed based on palynomorphs frequencies, demonstrating five distinct phases (SAP-I to SAP-V), which reflected different paleoecological conditions. The predominance of plants associated with grasslands in the phase SAP-I suggests warm and dry climate conditions. A gradual increasing of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynology; Paleoecology; Paleoclimatology; Atlantic rainforest; Late Holocene; Rio Grande do Sul State.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300020

Relationship between pollen morphology and chromosome numbers in Brazilian species of Lippia L. (Verbenaceae)
Provedor de dados: 42
Autores: Sousa,Saulo M.; Pierre,Patrícia M.O.; Torres,Giovana A.; Davide,Lisete C.; Viccini,Lyderson F.
The pollen morphology and exine structure of 17 species of Lippia L. were investigated in this work using light and scanning electron microscopy. Among the species studied, 14 showed tricolporate pollen grains, two had tri- and tetracolporate pollen grains and a single species exhibited, only tetracolporate pollen. The amb ranged from triangular to square, and the shape varied from oblate-spheroidal to prolate-spheroidal. Three different types of exine ornamentation were observed: psilate, scabrate and perforate. In addition to morphological data, we found positive association between the chromosome numbers and size of pollen grains, and also between the length and width of the colpi. The results indicate that the characteristics of pollen grains in Lippia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome numbers; Lippia; Palynology; Palynomorphology; Pollen; Verbenaceae.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100147

Model of wetland development of the Amapá coast during the late Holocene
Provedor de dados: 42
Autores: Guimarães,José T.F.; Cohen,Marcelo C.L.; França,Marlon C.; Lara,Rúben J.; Behling,Hermann.
The modern vegetation types, sedimentary sequences, pollen records and radiocarbon dating obtained from three sediment cores from Calçoene Coastal Plain were used to provide a palaeoecological history during the late Holocene of Amapá coastal wetland according to flood regime, sea-level and climatic changes. Based on these records, four phases of vegetation development are presented and they probably reflect the interaction between the flow energy to the sediment accumulation and the brackish/freshwater influence in the vegetation. This work suggests interchanges among time periods characterized by marine and fluvial influence. The longitudinal profile did not reveal the occurrence of mangrove in the sediment deposited around 2100 yr B.P. During the second...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon river; Climatic changes; Mangrove; Palynology; Sea-level.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200021

Palynological evidence of the replacement of the hygrophilous forest by field vegetation during the last 7,000 years B.P. in the northern coast of Rio de Janeiro, Brazil
Provedor de dados: 42
Autores: Luz,Cynthia F.P. da; Barth,Ortrud M.; Martin,Louis; Silva,Cleverson G.; Turcq,Bruno J.
Historians claim that European colonizers of the northern coast of Rio de Janeiro State found vast herbaceous fields when arrived in this region. Hypotheses about the origin of these fields include forest burning by the Goitacás indians and periodical floods by the Paraíba do Sul River and the lagoon system. The palynologycal analysis of two lake cores obtained in the municipality of Campos dos Goytacazes revealed opening episodes of hygrophilous forest and the establishment of field vegetation, recorded at ca. 6,500 and ca. 4,000 14C yr BP. The partial replacement of forest by field vegetation in the first episode was probably caused by floods of the lower areas during the development of the Holocene lagoon phase. During the second episode, successions of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Campos dos Goytacazes; Holocene; Palynology; Vegetation dynamics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300013